/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

#include "../../Application/jucer_Headers.h"
#include "jucer_ButtonDocument.h"
#include "../jucer_UtilityFunctions.h"

//==============================================================================
static const int normalOff = 0;
static const int overOff = 1;
static const int downOff = 2;
static const int normalOn = 3;
static const int overOn = 4;
static const int downOn = 5;
static const int background = 6;


//==============================================================================
ButtonDocument::ButtonDocument (SourceCodeDocument* c)
    : JucerDocument (c)
{
    paintStatesEnabled [normalOff] = true;
    paintStatesEnabled [overOff] = true;
    paintStatesEnabled [downOff] = true;
    paintStatesEnabled [normalOn] = false;
    paintStatesEnabled [overOn] = false;
    paintStatesEnabled [downOn] = false;
    paintStatesEnabled [background] = false;

    parentClasses = "public juce::Button";

    for (int i = 7; --i >= 0;)
    {
        paintRoutines[i].reset (new PaintRoutine());
        paintRoutines[i]->setDocument (this);
        paintRoutines[i]->setBackgroundColour (Colours::transparentBlack);
    }
}

ButtonDocument::~ButtonDocument()
{
}

static const char* const stateNames[] =
{
    "normal", "over", "down",
    "normal on", "over on", "down on",
    "common background"
};

static int stateNameToIndex (const String& name)
{
    for (int i = 7; --i >= 0;)
        if (name.equalsIgnoreCase (stateNames[i]))
            return i;

    jassertfalse;
    return normalOff;
}


int ButtonDocument::getNumPaintRoutines() const
{
    int n = 0;

    for (int i = 7; --i >= 0;)
        if (paintStatesEnabled [i])
            ++n;

    return n;
}

StringArray ButtonDocument::getPaintRoutineNames() const
{
    StringArray s;

    for (int i = 0; i < 7; ++i)
        if (paintStatesEnabled [i])
            s.add (stateNames [i]);

    return s;
}

PaintRoutine* ButtonDocument::getPaintRoutine (const int index) const
{
    int n = 0;

    for (int i = 0; i < 7; ++i)
    {
        if (paintStatesEnabled [i])
        {
            if (index == n)
                return paintRoutines[i].get();

            ++n;
        }
    }

    jassertfalse;
    return {};
}

void ButtonDocument::setStatePaintRoutineEnabled (const int index, bool b)
{
    jassert (index > 0 && index < 7);

    if (paintStatesEnabled [index] != b)
    {
        paintStatesEnabled [index] = b;
        changed();
    }
}

bool ButtonDocument::isStatePaintRoutineEnabled (const int index) const
{
    return paintStatesEnabled [index];
}

int ButtonDocument::chooseBestEnabledPaintRoutine (int paintRoutineWanted) const
{
    switch (paintRoutineWanted)
    {
        case normalOff: return normalOff;
        case overOff:   return paintStatesEnabled [overOff] ? overOff : normalOff;
        case downOff:   return paintStatesEnabled [downOff] ? downOff : chooseBestEnabledPaintRoutine (overOff);
        case normalOn:  return paintStatesEnabled [normalOn] ? normalOn : normalOff;
        case overOn:    return paintStatesEnabled [overOn] ? overOn : (paintStatesEnabled [normalOn] ? normalOn : chooseBestEnabledPaintRoutine (overOff));
        case downOn:    return paintStatesEnabled [downOn] ? downOn : ((paintStatesEnabled [overOn] || paintStatesEnabled [normalOn])
                                                                        ? chooseBestEnabledPaintRoutine (overOn)
                                                                        : chooseBestEnabledPaintRoutine (downOff));
        default: jassertfalse; break;
    }

    return normalOff;
}

//==============================================================================
String ButtonDocument::getTypeName() const
{
    return "Button";
}

JucerDocument* ButtonDocument::createCopy()
{
    auto newOne = new ButtonDocument (cpp);
    newOne->resources = resources;
    newOne->loadFromXml (*createXml());
    return newOne;
}

std::unique_ptr<XmlElement> ButtonDocument::createXml() const
{
    auto doc = JucerDocument::createXml();

    for (int i = 0; i < 7; ++i)
    {
        auto e = paintRoutines[i]->createXml();
        e->setAttribute ("buttonState", stateNames [i]);
        e->setAttribute ("enabled", paintStatesEnabled [i]);

        doc->addChildElement (e);
    }

    return doc;
}

bool ButtonDocument::loadFromXml (const XmlElement& xml)
{
    if (JucerDocument::loadFromXml (xml))
    {
        for (int i = 7; --i >= 0;)
            paintStatesEnabled [i] = false;

        for (auto* e : xml.getChildWithTagNameIterator (PaintRoutine::xmlTagName))
        {
            const int stateIndex = stateNameToIndex (e->getStringAttribute ("buttonState"));

            paintRoutines [stateIndex]->loadFromXml (*e);
            paintStatesEnabled [stateIndex] = e->getBoolAttribute ("enabled", stateIndex < normalOn);
        }

        changed();
        getUndoManager().clearUndoHistory();
        return true;
    }

    return false;
}

void ButtonDocument::getOptionalMethods (StringArray& baseClasses,
                                         StringArray& returnValues,
                                         StringArray& methods,
                                         StringArray& initialContents) const
{
    JucerDocument::getOptionalMethods (baseClasses, returnValues, methods, initialContents);

    addMethod ("juce::Button", "void", "clicked()", "", baseClasses, returnValues, methods, initialContents);
    addMethod ("juce::Button", "void", "buttonStateChanged()", "", baseClasses, returnValues, methods, initialContents);
}

//==============================================================================
class ButtonStatePaintEnabledProperty   : public BooleanPropertyComponent,
                                          private ChangeListener
{
public:
    ButtonStatePaintEnabledProperty (const String& name, ButtonDocument& doc, const int stateMethod_)
        : BooleanPropertyComponent (name, "enabled", "disabled"),
          document (doc),
          stateMethod (stateMethod_)
    {
        document.addChangeListener (this);
    }

    ~ButtonStatePaintEnabledProperty() override
    {
        document.removeChangeListener (this);
    }

    void setState (bool newState) override
    {
        document.setStatePaintRoutineEnabled (stateMethod, newState);
    }

    bool getState() const override
    {
        return document.isStatePaintRoutineEnabled (stateMethod);
    }

private:
    void changeListenerCallback (ChangeBroadcaster*) override
    {
        refresh();
    }

    ButtonDocument& document;
    const int stateMethod;
};

void ButtonDocument::addExtraClassProperties (PropertyPanel& panel)
{
    Array <PropertyComponent*> props;

    for (int i = 1; i < 7; ++i)
        props.add (new ButtonStatePaintEnabledProperty (stateNames[i], *this, i));

    panel.addSection ("Button paint routines", props);
}

//==============================================================================
class ButtonTestComponent   : public Button
{
public:
    ButtonTestComponent (ButtonDocument* const doc, const bool fillBackground)
        : Button (String()),
          document (doc),
          alwaysFillBackground (fillBackground)
    {
        setClickingTogglesState (true);
    }

    void paintButton (Graphics& g, bool isMouseOverButton, bool isButtonDown) override
    {
        if (document->paintStatesEnabled [background])
        {
            document->paintRoutines [background]->fillWithBackground (g, alwaysFillBackground);
            document->paintRoutines [background]->drawElements (g, getLocalBounds());
        }

        const int stateIndex
            = getToggleState()
                ? (isButtonDown ? document->chooseBestEnabledPaintRoutine (downOn)
                                : (isMouseOverButton ? document->chooseBestEnabledPaintRoutine (overOn)
                                                     : document->chooseBestEnabledPaintRoutine (normalOn)))
                : (isButtonDown ? document->chooseBestEnabledPaintRoutine (downOff)
                                : (isMouseOverButton ? document->chooseBestEnabledPaintRoutine (overOff)
                                                     : normalOff));

        document->paintRoutines [stateIndex]->fillWithBackground (g, ! document->paintStatesEnabled [background]);
        document->paintRoutines [stateIndex]->drawElements (g, getLocalBounds());
    }

private:
    ButtonDocument* const document;
    const bool alwaysFillBackground;
};

Component* ButtonDocument::createTestComponent (const bool alwaysFillBackground)
{
    return new ButtonTestComponent (this, alwaysFillBackground);
}

//==============================================================================
void ButtonDocument::fillInGeneratedCode (GeneratedCode& code) const
{
    JucerDocument::fillInGeneratedCode (code);

    code.parentClassInitialiser = "Button (" + quotedString (code.componentName, false) + ")";
    code.removeCallback ("void", "paint (Graphics& g)");
}

void ButtonDocument::fillInPaintCode (GeneratedCode& code) const
{
    jassert (paintStatesEnabled [normalOff]);
    String paintCode [7];

    for (int i = 0; i < 7; ++i)
        if (paintStatesEnabled [i])
            paintRoutines[i]->fillInGeneratedCode (code, paintCode [i]);

    String& s = code.getCallbackCode ("public juce::Button",
                                      "void",
                                      "paintButton (juce::Graphics& g, bool isMouseOverButton, bool isButtonDown)",
                                      false);

    int numPaintRoutines = getNumPaintRoutines();

    if (paintStatesEnabled [background])
    {
        s << paintCode [background] << "\n";
        --numPaintRoutines;
    }

    if (numPaintRoutines == 1)
    {
        s << paintCode [normalOff];
    }
    else if (numPaintRoutines == downOff && (paintStatesEnabled [overOff] || paintStatesEnabled [downOff] || paintStatesEnabled [normalOn]))
    {
        if (paintStatesEnabled [normalOn])
        {
            s << "if (getToggleState())\n{\n    "
              << CodeHelpers::indent (paintCode [normalOn], 4, false).trimEnd();
        }
        else if (paintStatesEnabled [overOff])
        {
            s << "if (isButtonDown || isMouseOverButton)\n{\n    "
              << CodeHelpers::indent (paintCode [overOff], 4, false).trimEnd();
        }
        else
        {
            s << "if (isButtonDown)\n{\n    "
              << CodeHelpers::indent (paintCode [downOff], 4, false).trimEnd();
        }

        s << "\n}\nelse\n{\n    "
          <<  CodeHelpers::indent (paintCode [normalOff], 4, false).trimEnd()
          << "\n}\n";
    }
    else if (numPaintRoutines == normalOn && paintStatesEnabled [overOff] && paintStatesEnabled [downOff])
    {
        s << "if (isButtonDown)\n{\n    "
          << CodeHelpers::indent (paintCode [downOff], 4, false).trimEnd()
          << "\n}\nelse if (isMouseOverButton)\n{\n    "
          << CodeHelpers::indent (paintCode [overOff], 4, false).trimEnd()
          << "\n}\nelse\n{\n    "
          << CodeHelpers::indent (paintCode [normalOff], 4, false).trimEnd()
          << "\n}\n";
    }
    else
    {
        if (paintStatesEnabled [normalOn] || paintStatesEnabled [overOn] || paintStatesEnabled [downOn])
        {
            s << "switch (getToggleState() ? (isButtonDown ? "
              << chooseBestEnabledPaintRoutine (downOn) << " : (isMouseOverButton ? "
              << chooseBestEnabledPaintRoutine (overOn) << " : "
              << chooseBestEnabledPaintRoutine (normalOn) << "))\n                         : (isButtonDown ? "
              << chooseBestEnabledPaintRoutine (downOff) << " : (isMouseOverButton ? "
              << chooseBestEnabledPaintRoutine (overOff) << " : 0)))\n{\n";
        }
        else
        {
            s << "switch (isButtonDown ? " << chooseBestEnabledPaintRoutine (downOff)
              << " : (isMouseOverButton ? " << chooseBestEnabledPaintRoutine (overOff)
              << " : 0))\n{\n";
        }

        for (int i = 0; i < 6; ++i)
        {
            if (paintStatesEnabled [i])
            {
                s << "case " << i << ":\n    {\n        "
                  << CodeHelpers::indent (paintCode [i], 8, false).trimEnd()
                  << "\n        break;\n    }\n\n";
            }
        }

        s << "default:\n    break;\n}\n";
    }
}
